Tractor-truck gearing



A ril 23, 1929. J. A. M GREW TRACTOR TRUCK GEARING Original Filed July 1925 XNVENTOR M Jam/I. /l["6rz0.

y m a qr fiommys reamed Apr. 4i

. UNITED;

1,710,372 PATENT OFFICE.

JOHN A, meanwyor Ans ANY, new Yoax, ASSIGNOR 'ro BETHLEHEM STEEL oomv V a: v v I.

armcroarauon amine.

rebuta filed July 8, 1925, Serial No. 42,160. Renewed March 9, 1929.

a M invention relatesto-automatically co n v nectible and disconnectible' 'powertransmitting mechanism for connecting a source of power to a driven element, for example, to tumbler gear mechanism for connecting and tion and disconnection ofthe tumbler gear in consequence of movement ofa-the auxihary "motor. I A further object of my invention is topro vide, in connection with driving and driv gears and a tumbler gear, the latter being con v ment21 pivoted, lit-22, with respect to the su stantly in mesh with thedriving gear and capable of being translatedfor entrainment and disentrainment with respect to the driven gear, an escap-ement mechanism for initially restraining rotary movement of the tumbler 2 gear about its axis, whereby, upon movement of the driving gear inone direction, the tumbler gear will be translated in an entraining.

direction in order to be brought into meshing relation with respect to the driven earand.

2 which, upon the tumbler gear being emeshedj from the driven gear and, moving in a disenj-"f training direction, engagesv the tumbloijg uij direction of the arrow shown in Fig. 2, the

to hold the latter for subsequent operation; These and other objects are accomplished by m invention as will be evident from a consi eration of the following specification and of the accompanying drawings, forming a part of this application, in which:

Fig. 1 is a detail fragmentary view showing thereto; Fig. 2 is a verticalsectional view showing my improvement. Referring now to the drawings more in dethe driving shaft 11, and" the shaft or axle 13 is preferably meet the load-bearing axles of a ocomotive tei ider truck.

- The driving and driven shafts, 11 and 13, respectively, are journaledv with respect to the support or frame 10 in parallel relation, and these shafts carry driving and driven toothed gears 14 and 15, respectively. A tumbler gear 16 meshes constantly with the driving gear Hand it is maintained in this relation by a apparatus with my improvement applied tail, I Show a frame orsupport'lti-having a'ererabl'y not fully disengaged from the tumdriving shaft or member 11 journaled thereab 3 in, and'theframe or support, -10"l-ias:.jo-u rhal i :bcarin s 12, which fit the-driven slm-fii jor fliil 13. T e frame or support/1O carries'engine or motorcylinders (not shown) whichdrive frame or tumbler support 17. The frame or support 17 is capableof an iar-movement with respect to the axis of .t e drivinggear in order; to move the tumbler gear, 16 to entrain and disentrain the latter with respect 60 to the driven gear 15. A spring 18 has one end thereof connected to the frame 17 and its other end anchored to the support. 10 and.

it-serves normally to bias. the frame 17 in a disentraining direction. 4 y I ;In order that the t bler gear may be .moved inan entraining direction, it is neces- *sary that rotation thereof about its axis be restrained; and to this end, I show an escape port 10 and'havingteeth 23and24 normal y engaged between teeth ofthetumbler gear 16 when the latter occupies its-,disentrainecl po-. sition, as indicated in full lines in Fig.2. Theplvot 22 is arran ed above or beyond the'teeth 23 and 24 in or er that the escapement may readily tilt as hereinafter set forth. The es Ifcape'ment member has the end thereof re mote from the driven gear weighted, as indi-' described.

cated atv25, forapurpose to beimmediately' when the driving gear 14is turned" in the j tumbler gear 16 is restrained from rotation about its axis due to engagement of the escape- 8 ment teeth 23 and 24 between the teeth thereof. Consequently the frame 17 and the tumbler I gear 16 are moved in an entraining direction; v and. while movement takes place in this direction, the escapement 21 tilts about its axis 22 in a direction opposite angularly to the entraining movement. In consequence of this, the teeth 23 and 24 act in succession on the tumbler gear 16and such teeth are'preflergear until teeth of the latter are initially gaged between *teeth of the driven gear 15. "Eromthe arrangement of gearing shown, it willi bef apparent that it is only necessary for the tips 0'. the teeth of the tumbler gearto first engage between theti s of the teeth of thedriven gear and that t ereafte'r the rel ative arrangement of gears and the directions of rotation thereof are such as to cause the tumbler gear to move completely into mesh with the driven gear. Although I prefer to have the tumbler gear engaged by the escapement teeth until this initial engagement of the tumbler gear teeth with the driven gear teeth takes place, it will be apparent that gear with the driven gear for the reason that disengagement of the escapement teeth might take place before engagement of the tumbler the tumbler gear and its frame are moving in an entraining direction and inertia effects are amply suiiicient to overcome the spring 18 and to secure enmeshment of the tumbler gear 16 with the driven gear 15.

The weighted end 25 secures reverse angular movement of the escapement 21 while the tumbler is being entrained in the manner first referred to and such angular movement is limited by a stop 26 so as to assure that, when the tumbler gear 16 is meshed with the driven gear 15, the escapement will be maintained out of contact with the tumbler gear and the tooth 24 thereof will occupy such a position that, when the tumbler gear and its support 17 move in a disentraining direction, such tooth will be initially engaged by the tumbler gear and the escapeinent will be tilted about its axis 22 until both teeth 23 and 24 are fully engaged between teeth of the tumbler gear 16, when the latter and its frame 17 occupy a normal disentrained position with the frame 17 engaging the stop 19, as shown in full lines in Fig. 2. l I s \Vhile I have shown and while I prefer to use an escapement or pawl device having a pair of teeth, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes 1 and modifications without departing from the spirit thereof, and I desire, therefore,

' that only such limitationsshall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims. i

Having thus described the invention what I claim as new and desire to secure by Letters Patent is:

1. In an apparatus of the character de- 1 scribed, the combination of a support or frame, driving and driven toothed gears rotatable about axes'which are fixed with respect to the frame, a tumbler toothed gear constantly in mesh with the driving gear,

and a member movable angularly about an axis fixed with respect to the frame and having a tooth for engaging between teeth of the tubular gear for restraining rotation of the latter, whereby the tumbler gear is translated in a direction to mesh with the driven gear when the driving gear is moved in one direction.

2. In apparatus of the character described, the combination of a support or frame, driving and driven toothed gears rotatable about axes which are fixed with respect to the frame, a tumbler toothed gear constantly in mesh with the driving gear, and a member rotatable angularly about an axis fixed with respect to' the frame and having a plurality of teeth for engagement between teeth of the tumbler gear for restraining rotation of gear when the driving gear is turned in one I direction.

3. In apparatus of the character described,

the combination of a support or frame, driving and driven members journaled in said support or frame, driving and driven tooth gears carried by the driving and driven members respectively, a toothed tumbler gear constantly in mesh with the driving gear, and a member pivoted with respect to the frame and having a tooth fitting between teeth of the tumbler gear for restraining rotation of the latter, whereby the tumbler gear is translated in a direction to mesh with the driven gear when'the driving gear is turned in one direction.

4:. In apparatus of the character described, the combination of a support or frame, driving and driven toothed gears rotatable about axes which are fixed with respect to the frame, a toothed tumbler gear, an angularly movable frame for supporting the tumbler gear with the teeth thereof constantly in mesh with the driving gear, a member movable about an axis fixed with respect to the support and having a tooth for engagement between teeth with the teeth thereof constantly in mesh.

with the driving gear, a member movable about an axis fixed with respect to the support and having a tooth for engagement between teeth of the tumbler gear for restraining rotation of the latter, whereby the tum,- bler gear is translated in a direction to mesh with the driven gear, means for normally biasing the tumbler gear frame in a direction to move the tumbler gear away from the driven gear, and means for limitin movement of the frame in the latter direction.

6. In apparatus of the character described,

the combination of a support, driving and driven members journaled in place with respect to the support, drivin and driven gears carried by the driving an driven members respectively, a tumbler gear constantly in mesh with the driving gear, and an escapement member having teeth engaging between teeth of the tumbler gear for restraining r0-.

tation of the latter about its axis, whereby the tumbler gear is translated in a direction to mesh with the driven gear when the driving gear is turned in one direction.

. ing and driven members journaled in place with respect to the support or frame, driving and driven gears carried by the driving and driven members respectively, a tumbler gear constantly in mesh ,with the driving gear, an escapement carried by the support or frame and having teeth for engagement between teeth of the tumbler gear to restrain rotation of the latter about its axis, whereby the tumbler gear is translated in a direction to mesh with the driven gear when the driving gear is turned inone direction, and means for biasing the escapement to tilt angularly in a direction opposite to the angular movement of the tumbler gear in movingin a meshing direction, whereby the teeth of the escapement are disengaged from the teeth of the tumbler gear when the latter is meshed with the driven gear and one of the teeth of the escapement is'in position to be engaged by the tumbler 7 gear when the latter is moved angularly in a demeshing direction. I

8. In apparatus of the character described, the combination of a support or frame, driving and driven members journaled in place with respect to said support or frame, driving or driven gears carried by the driving and driven members respectively, a tumbler gear constantly in mesh with the driving gear and movable angularly with respect to the axis of the driving gear to be entrained and disentrained with respect. to the driven gears, means for normally biasing the tumbler gear for angular translatory movement in a disentraining direction, an escapement pivoted to the support or frame and having a pair of teeth for engagement between teeth of the tumbler gear for restraining rotation of the latter about its axis, whereby the tumbler gear is translated in an entraining direction when the driving gear is turned in one direction, and means for causing the escapement to turn about its axis angularly in an opposite direction to the direction of entrainment while the tumbler gear is moving in an entraining direction, and means for limiting angular movementofthe escapement member,

whereby, when the tumbler gear is meshed with the driven gear the teeth thereof are free from the escapement teeth and one of the teeth of the escapement is in a position for, initial engagement by teeth of the tumbler gear when the latter moves in a disentraining direction in orderjto tilt the escapement to cause both teeth thereof to engage between teeth of the tumbler gear.

9. In apparatus of the character'described, the combination of a support or frame, driving and driven members journaled in place with respect to said support or frame, driving 7 or driven gears carried by the driving and driven members respectively, a tumbler gear, an angularly movable frame for supporting the tumbler gear and maintaining the latter constantly in mesh with the driving gear,

spring means tending to move the frame angularly to move the tumbler gear in a disentraining direction with respect-to the driven gear, an escapement pivoted to the support and having a pair of teeth for engagement between teeth of the tumblergear when the latter is in disentraining position for restraining rotation thereof about its axis, whereby the tumbler gear is translated in an entraining direction to mesh with the driven 7 when the latter moves in a disentraining direction in order to tilt the escapement to engage both teeth thereof between teeth of the tumbler gear when the latter occupies its normal disentrained position.

In testimony whereof I hereunto afiix my signature this 20th day of June, 1925.

' OHN A. MGGREW. 

